Method of making supports for sound reproducers



Dec. 15,1925. 6 566,162

' D. H. MOSS METHOD OF MAKING SUPPORTS FOR SOUND REPRODUCERS OriginalFiled Feb. 9, 1924 4 Sheets-Shee t 1 anomfoz 04100 H. Mafi Dec. 15,1925.1,566,162

D. H. MOSS METHOD OF MAKING SUPPORTS FOR SOUND REIRODUCERS OriginalFiled Feb. 9, 1924 4 Sheets-Sheet 2 DAV/I H M055 Dec. 15, 1925- I1,366,162

D. Hv MOSS METHOD OF MAKING SUPPORTS FOR SOUND REPRODUCERS OriginalFiled Feb. 9, 1924 4 Sheets-Sheet 3 anoenm D. H. MOSS METHOD OF MAKINGSUP PORTS FOR SOUND REPRODUCERS Original Filed Feb. 9, 1924 4 'sheetssheet 4 wuentoa DAV/D h. M055 Patented Dec. 15, 192 5.

UNITED? STATES. OFFTCEI DAVID H. MOSS,- OFxNEWARK, NEW JERSEY, ASSIGNOR,BY MESNEEASSIGNMENTS; TO BRANDES- LABORATORIES, INC., 0F; NEWARK,NEWi-JERSEY, A;C0 RPORATION OF NEW JERSEY.

METHOD OF MAKING SUPPORTS-FOR; SOUND =REPRODUCERS.

To all whom it may concern Be it known that I, DAVID I-I. Moss, acitizen of the United States, residing at Newark, in the county of Essexand-State of New Jersey, have invented a certain new and usefulImprovement in a Method of Making Supports forSound Reproducers,of;which the following is a specification.

My invention relates broadly to electromagn'etic sound reproducers,andmore particularly; to the, construction'of a support and an assemblyfor such electromagnetic sound reproducers, and the method of mak ingsuch support and assembly.

This application is a division of my copending application, SerialNumber 691,- 812, filed February 9, 192 1.

One of the objects of my. invention is to provide a support for anelectromagnetic sound reproducer which is capable ofirelativelyinexpensive manufacture on aquantity production basis by a series ofsteps which I have perfected.

Another object of my invention is to provide an arrangement of parts forelectromagnetic sound reproducer's-which may be readily assembled byrelatively unskilled labor for manufacturing sound reproducers on alarge production scale.

Still another object of my invention is to provide a construction ofbasesupport for an electromagnetic sound reproducer having its several partspressed from sheet metal in a succession of operations for developingand assembling the complete instrument" from raw material within arelatively brief interval of time with a high degree of manufacturingefficiency.

Other and further objects of my invention will be pointed out inthespecification hereinafter following by reference to the accompanyingdrawings, in which:

Figure l is an assembly viewofithe com' pleted electromagnetic soundreproducer or. table talker showing the assembly of' the support of myinvention Fig. 2 is ap lan. view looking down upon the supporting base;Fig. 3 is a cross sectional viewoft-theassembled base construction withthe electromagnetic sound reproducerv casing re moved therefrom Fig. 4is a plan view look ing upwardly below the basev with the. lowersupporting member removed; Fig. 5111115- Original application filedFebruary 9, 1924, Serial .No. 691,812. Divi ded and th'isapplicationfiled March Serial No. 13,009.

trates the top of thebase member before the lip portions which fori'nthegripping collar;

ofthebase about the side wall of the electromagnet'ic; soundreproducercasing have been turned downwardly; Fig. 6 is a perspec'tive view of thegripping collar which is employed to draw the lips of the support ng.flange of the base against the side walls of the electromagnetic soundrepro ducer; Figs. 7, 8 and 9- a'refviewsof. the cap wh ch I employ forlocking the electromagnetic sound reproducenin fixed posit on withrelation to'the base; F ig. 10 is a view illustrating the assembly.process of the complete parts of the'support; Fig. 10.

Heretofore in the art, electromagneticsound reproducer-s used inconnection with radlo receiving apparatus have been rela:tivelyexpensive. in construction, due, among other things, to thefailure of-manufacturers to discover methods of manufacturing the partsof the reproducer associatedwith the electromagnetic mechanismin asystematic order,- witli parts so. related that they might bereadily,assembled in producing the complete instruments. Ihave developed aconstruction of suppjort for an electromagnetic sound reproducer'whichmay be produced by a succession ofcutting and {pressing operations witha molded cap member for the casing of the electromagnetic soundreproducer arranged for assembly with the pressed parts to, produce aninexpensive and effective instrument. One of the problems solved by myconstruction is the unitary assembly of the base and electromagneticsound reproducer casing by means of molded projections on the cap whichcooperate withapertures in the top base member to prevent relativerotation of the electromagnetic sound reproducer casing and the base.Still another feature of my invention is the method by which I cover thelower base member with felt or cloth and at the same time securenecessary weight in the base of the instrument to position the center ofgravity very near the supporting surface. I accomplish this by a diskmember having an upturned annular flange which fits snugly within theinterior of the lower base member drawin the felt or cloth over thebottom and sides of the lower base member.

Another feature of the invention is the provision of depending lips ortongues on the top base member which may be drawn together by an annularcollar to frictionally grip the walls of the electromagnetic soundreproducer casing, preventing the vertical withdrawal of theelectromagnetic sound reproducer from the base at the same time that theaforementioned projecting tongues on the cap preclude relative rotationof the cap and base.

Referring more particularly to the drawings, the assembled table talkeris shown in Fig. 1 comprising an acoustic horn, a casing 2 for theelectromagnetic sound reproducing mechanism, a cap 3 on the casing inwhich is secured a ferrule l and the entire assembly supported in base5. The conductors leading to the electromagnetic operating mechanismpass into the base 5 through cable 6. The supporting base 5 comprises aplurality of parts including atop portion 7 and a lower base portion 8.The base portion 8 and the top supporting base 7 are assembled, as moreclearly shown in Fig. 3, wherein a layer of felt or other cloth 9 isrigidly drawn over the bottom and sides of the base 5) by means of adisk insert 10 which is pressed into the interior of the base portion 8.The felt 9 on the exterior walls of the base aortion 10 serves tofrictionally bind the base portion 7 and 8 together when the portion 8is forced into the portion 7.

As represented in Fig. 11 the base portion 7 is initially die pressed tothe shape shown. The excess material of the flange 11 and the centralmaterial 12 in the interior of the base portion 7 is cut off and punchedout in an operation resulting in the product illustrated in Fig. 12. Theremoval of the material in the center of 12 leaves a plurality oftongues 14, 15, 16 and 17 protruding toward the center of the baseportion 7 as illustrated more clearly in Fig. 12, and Fig. 5. Thetongues are spaced apart by slots 18, 19, 20 and 21. In the operationillustrated in Fig. 13, I press the tongues 14%, 15, 16 and 17downwardly and at the same time an aperture 22 may be punched into base7 to permit passage of the conductor 6 therethrough. In the operationillustrated in Fig. 14: the aperture 22 for the conductors is drawninwardly, providing round smooth edges 23 to facilitate the passage ofthe conductors into the base. In Fig. I show the operation by which thesharp edges of the conductor entrance are rolled over and smoothed off,as illustrated at 24:. The final operation on the base portion 7 isillustrated in Fig. 16 wherein a series of apertures 25 are punched inan annular ring about the flattened top of the base 7. These aperturesare more clearly illustrated in plan view in Figs. 2, 4L and 10 As shownin Fig. 17, the lower base member 8 is formed from flat sheet materialby a pressing operation which provides an annular upstanding skirtconnected with a horizontal circular bottom plate depressed from theplane of the bottom member 8 as indicated at 27. The skirt- 26 is thenupset forming a shoulder 28 adjacent the plane of the bottom base member8 as represented in Fig. 13 completing the stamping and pressingoperations upon this lower base member.

The insert member represented by reference character ll) is cut andpressed from sheet metal to the shape represented in Fig. 19. Theseveral parts are assembled together as represented in Fig. wherein thecircular felt sheet 9 is stretched over the lower base member by thetelescopically fitting insert 10 within the lower base member 8.

it will be understood that after the completion of the cuttiig andpressing operations upon the base members that the material is subjectedto heat treatment for ornamenting and beautifying the exterior surfaceappearance.

As represented more clearly in Figs. 7, 8, 9 and 10, the electromagneticsound repro ducing mechanism within the casing is provided with a moldedcap 3 having depending projections 29, 30 and 31. The projections arespaced at intervals about the periphery of the lower edge of the skirt32 of the cap 3 in proportion to the distances between the apertures andthe upper base member 27. Then the instrument is to be assembled, theseprojections 29, and 31 enter corresponding apertures 25 and lock theelectromagnetic mechanism against rotation with respect to the base. Thecap 3 is thickened at its central portion 33 and threaded to re ceivethe ferrule 4 serving as a seat and support for the acoustic horn 1.When the assembled table talker is inserted vertically downwardly intothe supporting base and the projections 29, 30 and 31 passed intoapertures 25 locking the instrument with respect to the base, I claspthe casing 2 by frictional engagement with the depending lips, 14:, 15,16 and 1'? by means of a collar band 34lshown more clearly in Fig. 6.The band 34 is provided with a pair of interiorly directed projections35 tending to bite into the casing 2 between a pair of the diametricallyopposed slots 18, 19, 20 and 21. The collar 34L is drawn tightly againstdepending lips 14:, 15, 16 and 17 by means of screw member 36. After thetable talker has been firmly anchored against removal from the basemember 7, the lower base member 8 is telescopically inserted within theupper base member 7 as heretofore described. The completed instrument issubstantially sealed against tampering and requires no adj ustrng afterpassing a final and rigid factory 1nspection.

The metallic insert 10 serves not only as a means for stretching thefelt 9 over the lower base member 8, but also as a weight to lower thecenter of gravity of the table talker. By this arrangement of telescopicmembers I avoid the necessity of gluing the felt to the base and securea much more uni form product by reason of the tight stretching of thefelt over the shoulder 28 which adds to the esthetic qualities of theinstrument.

The construction of the support as hereinbefore described and the methodof manufacturing the same has been found to be one of the practicalembodiments of the invention, but it is to be understood thatmodifications maybe made and that I intend no limitations upon theinvention other than are imposed by the scope of the appended claims.

That I claim and desire to secure by Letters Patent of the United Statesis as follows:

1. The method of manufacturing a support for an electromagnetic soundreproducer which consists in stamping an upper base member tosubstantially the contour of a finished base with a substantially flatcentral portion, punching out said central portion in a shape to providea plurality of inwardly extending lips, pressing said lips verticallydownward and simultaneously providing an entrance for a conductor intosaid base, enlarging said entrance and smoothing down the side wallsthereof, and providing a plurality of apertures in the top of said basemember for cooperation with a plurality of projections depending from acap secured to the casing of an electromagnetic operating mechanism.

2. The method of manufacturing a supporting base for an electromagneticsound reproducing mechanism which consists in pressing an upper basemember to substantially the shape of a finished base with asubstantially flat central portion, removing a portion of the materialin said substantially flat portion for providing a plurality of inwardlyextending lips, pressing said lips vertically downward, providing alower base member with an annular skirt, upsetting a portion of theskirt, and providing a disk insert member having an upwardly pro jectingannular skirt, the diameters of each of said members decreasing toenable said members to be mutually telescoped.

3. The method of manufacturing a support for an electromagnetic soundreproducer which consists in die pressing to shape an upper base member,cutting off the excess at the periphery thereof and simultaneouslypunching out the center thereof to form inwardly extending tongues,bending said tongues to provide a central seat for an electromagneticsound reproducer and closing the base of said upper base member.

4. The method of manufacturing a support for an electromagnetic soundreproducer which consists in die pressing a flat sheet of material to acircular shape having a relatively small diameter at its top and arelatively large diameter at its base, cutting off excess material atthe base, punching out material at the top in the form of inwardlyextending tongues pressing said tongues downwardly for forming asupporting surface and closing the base.

5. The method of manufacturing a support for an electromagnetic soundreproducer which consists in die pressing a flat sheet of material to acircular shape having a relatively small diameter at its top and arelatively large diameter at its base providing said base with atelescoping edge, stamping out a bottom closure member adapted totelescope within said telescoping edge and closing said base andproviding downwardly extending tongues from said top for frictionallyengaging the walls of an electromagnetic sound reproducer.

6. The method of manufacturing a support for an electromagnetic soundreproducer which consists in pressing a flat sheet of materialsubstantially in the form of an inverted cup with a flat central portionat its top connected by an outwardly flaring base, punching out saidflat central portion to provide inwardly extending tongues, bending saidtongues downwardly for binding an electromagnetic sound reproducer insaid base and closing said base with a flat circular sheet of material.

7. The method of manufacturing a sup port for an electromagnetic soundreproducer which consists in pressing a flat sheet of materialsubstantially in the form of an inverted cup with a flat central portionat its top connected by an outwardly flaring base, punching out saidflat central portion to provide inwardly extending tongues, and a flatperipheral ledge, piercing said ledge with apertures, pressing saidtongues downwardly for forming a seat in said top for an electromagneticsound reproducer and closing said base by a flat circular sheet ofmaterial.

DAVID H. MOSS.

